/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.tools.datasource.dao;

import org.apache.dolphinscheduler.common.utils.ConnectionUtils;
import org.apache.dolphinscheduler.spi.enums.DbType;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

@Service
public class MySQLUpgradeDao extends UpgradeDao {
  public static final Logger logger = LoggerFactory.getLogger(MySQLUpgradeDao.class);

  private MySQLUpgradeDao(DataSource dataSource) {
    super(dataSource);
  }

  @Override
  protected String initSqlPath() {
    return "create/release-1.0.0_schema/mysql";
  }

  @Override
  public DbType getDbType() {
    return DbType.MYSQL;
  }

  /**
   * determines whether a table exists
   *
   * @param tableName tableName
   * @return if table exist return true，else return false
   */
  @Override
  public boolean isExistsTable(String tableName) {
    ResultSet rs = null;
    Connection conn = null;
    try {
      conn = dataSource.getConnection();
      rs = conn.getMetaData().getTables(conn.getCatalog(), conn.getSchema(), tableName, null);
      return rs.next();
    } catch (SQLException e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException(e.getMessage(), e);
    } finally {
      ConnectionUtils.releaseResource(rs, conn);
    }

  }

  /**
   * determines whether a field exists in the specified table
   *
   * @param tableName  tableName
   * @param columnName columnName
   * @return if column name exist return true，else return false
   */
  @Override
  public boolean isExistsColumn(String tableName, String columnName) {
    Connection conn = null;
    try {
      conn = dataSource.getConnection();
      ResultSet rs = conn.getMetaData().getColumns(conn.getCatalog(), conn.getSchema(), tableName, columnName);
      return rs.next();

    } catch (SQLException e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException(e.getMessage(), e);
    } finally {
      ConnectionUtils.releaseResource(conn);
    }

  }

}
